So after years of reloading and thousands of primers I had one go off while hand priming. I always try and wear glasses and keep cases pointed away from me for this very reason. I was hand priming some 223 and a case must have slipped through that still had the crimp, so squeeze a little harder and it will go right? Well it went alright. My poor dog who was fast asleep at my feet will never be the same. Anyway always be safe out there guys.